Hawthorn is a plant. The leaves, berries, and flowers of hawthorn are used to make medicine. Hawthorn is used for diseases of the heart and blood vessels such as congestive heart failure, chest pain, and irregular heartbeat. It is also may be used to treat both low blood pressure and high blood pressure, “hardening of the arteries” (atherosclerosis), and high cholesterol. It is loaded with antioxidants and is a source of polphenols which are antioxidant compounds in plants which neutralize unstable molecules called free radicals. Hawthorn berry has been used as a digestive aid for centuries. It can decrease the transit time of food in your digestive system. Its fiber content is a prebiotic and may help relieve constipation.